a a x1 b x1 a a a x1 a b a x1 a b a x1 b b b x1 a a a a x1 a a b a a x1 a a b a x1 a b b a b x1 a b a a x1 b a b b a x1 a b b a x1 b b b b b x1 a a a a a x1 a a a b a a a x1 a a a b a x1 a a b b a a b x1 a a b a a x1 a b a b a b a x1 a a b b a x1 a b b b a b b x1 a b a a a x1 b a a b b a a x1 a b a b a x1 b a b b b a b x1 a b b a a x1 b b a b b b a x1 a b b b a x1 b b b b b b b x1 a 1 b 1 FULL ./SRS/Zantema06/17.srs